Element with atomic number 38, belongs to

Answer

To determine the classification of the element with atomic number 38, we will follow these steps:

### Step 1: Identify the Element
The element with atomic number 38 is strontium (Sr).

### Step 2: Determine the Electronic Configuration
To find the electronic configuration of strontium, we fill the orbitals according to the Aufbau principle:

1. **1s²** (2 electrons)
2. **2s²** (2 electrons)
3. **2p⁶** (6 electrons)
4. **3s²** (2 electrons)
5. **3p⁶** (6 electrons)
6. **4s²** (2 electrons)
7. **3d¹⁰** (10 electrons)
8. **4p⁶** (6 electrons)
9. **5s²** (2 electrons)

Adding these up gives us:
- 2 (1s) + 2 (2s) + 6 (2p) + 2 (3s) + 6 (3p) + 2 (4s) + 10 (3d) + 6 (4p) + 2 (5s) = 38 electrons.

Thus, the electronic configuration of strontium is:
\[ \text{[Kr]} 5s^2 \]

### Step 3: Determine the Block, Period, and Group
- **Block**: Since the last filled subshell is \( s \) (5s), strontium belongs to the **s-block** of the periodic table.
- **Period**: The highest principal quantum number in the electronic configuration is 5, so strontium is in **Period 5**.
- **Group**: Strontium has 2 electrons in its outermost shell (5s²), placing it in **Group 2** of the periodic table.

### Conclusion
The element with atomic number 38, strontium (Sr), belongs to:
- **Group**: 2
- **Period**: 5
- **Block**: s-block

### Summary
Strontium (Sr) is an s-block element in Group 2 and Period 5 of the periodic table.

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